(VinePair) - At first stroll, the Green String Farm at Cline Family Cellars doesn’t seem different from other agricultural plots in Sonoma wine country. Rows of vineyards cover the landscape, a barn rises on the horizon, and chickens cluck happily in the distance. The place looks, feels, and sounds like Sonoma.

But then, if you’re lucky, you’ll see them. The sheep.

Mewing and grazing, a happy herd marches through Cline’s vineyard, undeterred by the moveable fence that surrounds them. Bit by bit, they cover the land, momentarily turning blocks of green vineyard white as they mow down weeds and munch the canopy of grapevines. They look alarmingly out of place — won’t those animals hurt the grapes? Shouldn’t the sheep graze in an empty field?